Incandescent electric lamp



(No Model.)

A. o. OAREY. INGANDESCBNT ELECTRIG LAMP.

No.,470,471. Patented Mar. 8, 1892;

'i NITED STATES PATENT OFFICE.

AUGUSTUS C. CAREY, OF LAKE PLEASANT, MASSACI-IUSETTS.

INCANDESCENT ELECTRIC LAM P.

SPECIFICATION forming part of Letters Patent No. 470,471, dated March 8, 1892.

Application filed August 3, 1891. Serial No. 401.567, (No model.) a. A

To all whom it may con/corn:

Be t known that I, AUGUsTUs C. CAREY, a citizen of the United States, residing at Lake Pleasant, in the county of Franklin and State of Massachusetts, have invented a certain new and useful Improvementin Incandescent Electric-Light Lamps, of which the following is a full, clear, and exact description.

Vhen the carbon filament of an incandescent lamp is exhausted or burned out, the lanp is said to be dead and is thrown into the waste heap.

The object of my invention is to save the bulb andits appurtenances and Supply a new filament at considerably less cost than an entirely new lamp.

In attaining the object of my invention I open the bulb at its teat end, remove the eX- hausted filament, replace it by a new'filament, and again exhaust and seal the bulb, all as I will proceed now more particularly to describe and finally claim.`

In the accompan ying drawings, illustrating my invention, in the several figures of which like parts are similarly designated, Figure l is an elevation of a dead lamp. Fig. 2 illust'ates the first step in praoticing my invention; Fig. 3, the second, but showing a form of sleeve not here clained; and Fig. 4, the final step, this last figure showing the preferred form of joint for securing the new filament to the loading-in wires. Figs. 5 and 6 show in longitudinal and cross-section this preferred form of joint.

In practicing ny invention I-take an exhausted or dead lamp a (such as shown in Fig. 1) and by heat reduce the teat b to a pla;- tic state, push a tool through it, and enlarge the opening, as shown in Fig. 2. The eX- hausted filament c is then withdrawn and the leading-in or circuit wires d d cleansed of adhering parts. If the bulb be foul, it may be cleansed by brushes or other means. I then take anew filament e and fasten to its ends by cement or other means metallic joints-such as sleeves f-and inserting the filament thus prepared into the bulb I connect the sleeves With-the leading-in wires d d and complete the joint by pinching the sleeves about the loading-in wires, or by adding cement in those portions of the sleeves which are to receive the leading-in wires, or by soldering or electric welding, 0r other means. A glass tube g,

Fig. 3, is then attached to the opened bulb, the air exhausted from the bulb, and the bulb ing-in wires in the inner tubes in order to 4 have the two legs of the filament-loop as far apart as may be. These sleeves or tubes nay be made of thn platinum or of thin sheet y metal coated with solder, and can be soldered or made fast to the platinum circuit-wires in the bulb by means of heated pinchers or other sutable appliances, thus making a sure and perfect 'union of the parts,`insuring a perfect electrical contact.

My improved means of applying filaments effects a great saving in the use of incandescent electric lamps, for the reason that the exhausted carbon filament may be replaced again and again in the old bulbs, heretofore considered useless, so as to be substantially equal to the original lamp in illurninating power and time of endurance. The number of times that the carbon filament may be renewed is praotically Unlimited. A renewed lamp is not nearly so liable to break as a new one, for the reason that in consuming the original carbon filament the bulb has been heated many times and has become partially annealed, and therefore much tougher, and

the brass cap or butt, the plaster, and the l the carbon filanent may be applied to the circuit-wires by means of sleeves, as above described, and the whole nserted into the bulb through the butt of the lamp and sealed therein, after which the air is exhausted and the lamp sealed.

What I claim is-- 4In an electric-light lamp, leading-in or circuit wires, an incandescent filament, and a joint therefor composed of a double tube in which the ends of the filament, and leadingin or circuit wires are secured, substantially as described.

In testimony whereof I have hereunto set my hand this l9th day of June, A. D. 1891. AUGUSTUS O. CAREY. Witnesses:

DANA MALoNE, J oHN D. BoUTER. 

